1909 — 10 .] 
Meetings of the Society. 
587 
NINTH ORDINARY MEETING. 
Monday , 21 st March 1910. 
Dr R. H. Traquair, F.R.S., Vice-President, in the Chair. 
The following Communications were read : — 
1. A New Species of “ Rotating Sector ” for varying at will the Intensity of a Beam of Light. 
(The Apparatus teas exhibited.) By Dr J. R. Milne. (Lantern Illustrations.) Proc., vol. xxxi. 
2. A Flicker Spectro-Photometer. (The Apparatus was exhibited.) By Dr J. R. Milne. 
(Lantern Illustrations . ) 
3. A Chemical Investigation into the Nature of the Clay Substance in the Clenboig Fireclay. 
By D. P. M‘Donald, M.A., B. Sc. Communicated by Professor J. W. Gregory. Proc ., vol. 
xxx. pp. 374-377. 
4. On the Chemical Classification of Igneous Rocks. By Dr Warth. Communicated by 
Professor James Ceikie. 
5. Contributions to the Chemistry of Submarine Glauconite. By Dr W. A. Caspari. Com- 
municated by Sir John Murray, K.C.B. Proc., vol. xxx. pp. 364-373. 
William J. Watson, M. A., B. A., and Professor Gwynne- Vaughan signed the Roll, and 
were duly admitted Fellows of the Society. 
Lewis Bennett Barclay, C.E., was balloted for and declared duly elected a Fellow of the 
Society. 
TENTH ORDINARY MEETING. 
Monday, ‘Ind May 1910. 
Professor T. Hudson Beare, Vice-President, in the Chair. 
The following Address was delivered : — 
The Dynamics of Molecular Diffusion in Fluids, with Extension to Suspended Particles. By Sir 
Joseph L armor, M.A., F.R.S., Lucasian Professor of Mathematics, St John’s College, Cambridge ; 
Secretary Royal Society of London. 
The Chairman read a Short Obituary Notice of the late Lord M‘Laren. 
A Vote of Thanks to Sir Joseph L armor for his Address was moved by Professor Gray and 
seconded by Dr C. G. Knott. 
ELEVENTH ORDINARY MEETING. 
Monday, 1 6th May 1910. 
Emeritus- Professor Crum Brown, F.R.S., Vice-President, in the Chair. 
The following Communications were read : — 
1. Equilibrium in the Ternary System : Water, Potassium Carbonate, Potassium Ethyl Di- 
propylmalonate. By J. W. M ‘David, B.Sc., Carnegie Research Scholar. Communicated by 
Professor James Walker. Proc., vol. xxx. pp. 440-447. 
2. A Method for Determining Boiling-Points under Constant Conditions. (Abstract.) By 
Professor Alex. Smith and A. W. C. Menzies, U.S.A. Communicated by Professor James 
Walker. Proc., vol. xxx. pp. 432-435. 
3. A Common Thermometric Error in the Determination of Boiling-Points under Reduced 
Pressure. (Abstract.) By Professor Alex. Smith and A. W. 0. Menzies, U.S.A. Communicated 
by Professor James Walker. Proc., vol. xxx. p. 436. 
4. A Simple Dynamic Method for Determining Vapour Pressures. (Abstract.) By Professor 
Alex. Smith and A. W. C. Menzies, U.S.A. Communicated by Professor James Walker. 
Proc., vol. xxx. pp. 437-439. 
5. The Mathematical Theory of Random Migration, and Epidemic Distribution. By Dr John 
Brownlee. Proc., vol. xxxi. 
6. The Inheritance of Complex Growth Forms, such as Stature, on Mendel’s Theory. By Di- 
John Brownlee. Proc., vol. xxxi. 
7. Craniological Observations on the Lengths, Breadths, and Heights of 100 Australian 
Aboriginal Crania. By Dr A. W. D. Robertson. Communicated by Professor R. J. A. Berry. 
Proc., vol. xxxi. pp. 1-16. 
